On the basis of the following observations made with aqueous solutions, assign secondary valences to metals in the following compounds:

Explanation

`PdCI_(2)4NH_(3)`,moles of AgCl precipitated = 2, so it is `[Pd(NH_(3))_(4)CI_(2)`
`NiCI_(2).6H_(2)O`, moles of AgCl precipitated 2, so it is `[Ni ( H_(2)O)_(6)]CI_(2)`
`PICI_(4) 2HCI`, moles of AgCl precipitated = 0, so it is `H_(2)(PtCI_(6)]`
`CoCl_(3)4NH_(3)`, moles of AgCl precipitate = 1, so it is `(Co(NH_(3))_(4)CI_(2)CI`
`PICI_(2) 2NH_(3)`, moles of AgCl precipitated = 0, so it is `[PI(NH_(3))_(2)CI_(2)]`